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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b1a675706c5f5666b0defffe9c50932b7d74d615694dc574ce34bb57a70ca91' 
  AND token = 'ZqbZTVco9aXBiX/F7ZAFSBqDfkcZqdMHsNbd16+sfOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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