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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84e219e9fec2bde925c09631fd473f828e1d964ebe19e6e97faed860a7c0c8d2' 
  AND token = 'Ygc+SHTQosqCdEljvicvuDFksvvkPpZIM7K+X1kx18o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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