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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '804eada1dac2cfdce12dbe7c2b221af48c3b639d9702d1636c18f13bab458de6' 
  AND token = 'RCgCkQjZjYHCyb5+agTU/u2wm9w2YPYdUXAXcat11ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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