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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5db12a784e7d2f85626880e80eacfafa447fd193f5e1c20cd842f1393602188f' 
  AND token = 'EeW6d2DagHwjLfxeGjrRGV1Wl/i0zLzXhsSijFOJANw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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