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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c88868c82369ba61cf17936c3175eadd5625153624509dcb9eae342719400f63' 
  AND token = 'R2kPM4SOwzx+tHYNTCRO0+AD6i+nfN3V/SoQhk6Hm8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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