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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb7809b27c4f1b62926d34fa0e9d2d991fb4872c2cae91f9e329bfc5ece6bc0' 
  AND token = 'CqN/UeFmUbltssii2YzNHwXZ3Yog//YXzjAeNm5n3tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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