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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b09fab2b4b80c3db0b2307b5d956ca26b5235d98ba8a7f35ef9a24b435b1b588' 
  AND token = '1OommiMP1atkGZ4wzZFyd+pRlPjsTy++i4DkeFkPmSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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