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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c312ecaf3c3c981e25832630c9db52ca3136815d31ba9796b7e552a0ef916bee' 
  AND token = '/J1vXOGrGcAnjts4Wj46zWUu5WurCq3nQDQqUqE/Neg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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