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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75e64021ea0ba4f73a24be937ece42450838facd10ae0f48fc0598b5f18f58a8' 
  AND token = 'gw3ia0DVp2ohAz2XV6eQkQY9swMCgPZwPgQXDHDkLPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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