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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd94e0cb424c3e3d52dd20a7054b48df62f2cb34c1330a7935f7e75353e2f54e8' 
  AND token = 'bBF35hP3kk6WFbMVW6WCVoSP4ThqIDfWnLyq90xKLWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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