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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f70d2f7b95bd25c09d522321a58a2a737d8ded92c9df6a2ee2a24922aea3a8a' 
  AND token = 'HpsCtZeqC1dgQAiBtASmCW5sHH3lACHLccCR/TqDLtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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