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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5eef7d974a49fde74ef5874f1660357da23ef103a2e3d2e99d887980bb5e85' 
  AND token = 'saaLgbneEXFXFo6J4shTi6UzO0OA8cABXQ6tnlC/J/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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