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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7cdb919e4c4f7bc1ccbbaa1c94395ed1a781a5b20137aac77da79494c5a747d' 
  AND token = 'DKVNHIOHjYp1fst3JBfei1n4K3kWLlZsoUvgc8pmbsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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