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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f36f2e984ca4d3891332f91e3398ff2a2d22c243d4f52d7e3687252650fcff22' 
  AND token = 'aQrD4pWbp0TQT2lGghnVsu/SbNRgdHurH9KoXLT+i98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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