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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b8835143dc282e5ee15d174195b1170ddaa8d746ab33ddfeecb8363bc56b18a' 
  AND token = 'AcR9TNhOXMadeRNTqAf3683SX7x7L2flSvJUURm/Ge8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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