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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a3aeceb19391d5b575d870563a6a353a68b2673aac783cc50f2a37ed49e8a47' 
  AND token = 'kHNGtedgjiwHBYW5qLc6rFjjMQEqlVlskkCcOQtNG3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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