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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05179eca32985381aba7045a3501c784b7ef284a13aeaa5e58dd4d43d2b2335d' 
  AND token = 'OuaX9T0+w2SlEv1Fh1bui8L6LuwvFIcWDPCiCkMXchk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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