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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aab458037c050c2b2b5c271b0a016f7a1daddaf5896f084f191e4606064978d' 
  AND token = 'wLq3u+bw1jEB555mgUxMuXcgd0rqRLQJs59pR8i6az8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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