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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c53fe01b98f6fc22501ca8f3de9fad336249e3870affa634a62fd091462388c4' 
  AND token = 'qYCzLA5b5PF3qxO37ptr1PftHw+tly9i7I6SSrSFoNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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