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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb753419d55e7e03c9a7b09939b4899c8b3e21c8eea078ca9137b85cac5df90c' 
  AND token = '3dU4BFyDD0htVCKBlmnLZbKFPFYk3Y7rVEJ9wZNDj9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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