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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '177b2d2651efe1c1bb57e4b7ab37fbf9b650926de4811af9d249aade6f52bde2' 
  AND token = 'Ygqne0q/pk9uL9TV7sByO2HNtP2ghYCsAL13XvUOOXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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