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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed0c4004ddd0cd9b641e4d852a4a40c20bc8134697f744bc69e64c1a46c7c9ff' 
  AND token = 'OlpIJlVqpqzFG5tPDYizMRQZ3w/c3a4pJs5tpHa1E/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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