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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01526cc90f8147deabb76da01f8968f3a2f169fa3f13fb5c3851cf7825c62b02' 
  AND token = 'ApO2CtkKL9yMf8zAtkdLv2fkTfkY6G5M998qRe2iQek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}