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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '186be1cff8bf63a70344b1a4a93fa00c7bb19f7fdb121ba0992e9220bd6136d4' 
  AND token = '+DDZleBkQ73h1NfwnOsc/XlagGlW3IejKGf0okAH1ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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