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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a938e829a9124294c99d63f85c1a1ec0b0986f6134c2c86a5a7b1dc74d2165e9' 
  AND token = 'SHNHx4vc0tsbVW1mYaH2RW+2CeL7nwIQaUsMpxNxWoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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