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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15f81f02887f18f96a5d891c7ddbf9ef99722da6ea4c40f4bde8693ccde7593d' 
  AND token = 'vvkDU3Dw4MUxk2VdB2R1ST1YjwaswV+SUvptb0y+3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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