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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a01734e02683400b08efb8f764baeee0eebc7857c7242ea700c44c5b15e6128' 
  AND token = 'f85Zzj586wIgUTmcM81b2BKxCg8Sj0w3ZXum2Fh2JgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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