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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2f625ced34e96f092a1167fbd9c3b4652503473a0bec8d86bcc3153382b808f' 
  AND token = 'SzNIAD7g11gcPepcjYmgFsepH2xy/SKkh0IfFO10298=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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