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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a418b40fdb1b69b6c10aaa551245c418a52686e6c2304665fa6606e54b1bcdba' 
  AND token = 'B91pTouZj17unad7GcEpdPOjBS2ECzTRLFQDep2nCFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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