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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '771d69bd3d07ecba9666aed5430879e04f426da5e8d326217cfbdfc38b67f55a' 
  AND token = 'RO05A9dkoCsT3JyZlrPRO0MYnJEqSe/9UJ2ZlbhUYBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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