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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '989f992d72c3ae3bf8438e101eccc1e7727c344c9ad96659557a7532e49b9486' 
  AND token = 'rn3pYwB5B2RaMrVyrJVApXXEmXEq0ra3mEpFIsiPwX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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