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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b931eadba9ab1ce82894c4113b3ae7ca99e34289f4a26b491e2083017dc7017' 
  AND token = 'WlZ8fCE4tHc5p2ZEVMV6dzOIPRWU7b26QgKIQBKNwIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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