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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e82af03d7659867da591282310aa3c01d01223652d1298546cdd24d42d101b2' 
  AND token = 'ujTSoSVmjaBG7kRxGiRoi/Tnl/j/3ZlF4Pj36mPTrb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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