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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '850a60e415baa5175d15a1ca5717ada4185b9d19c4d764f9ac962336b7979177' 
  AND token = 'IpuyM89KQF2jAm6Dq/OyYdUDnREs/+R0guUJCAcxonE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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