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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1de02c42b8d4ca1f8ca33d0ffebe9f30939f7747e4003e0bd35f03717aa0733c' 
  AND token = 'xlF8EQPc8egTRANqJvWfb61fv9MyBjj95AuJjJRcG54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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