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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac3ac00c2aa9b0feed8265870e5d02387d4bda423712d6ba0269525200f6b9bc' 
  AND token = 'ZRZHwjwHnSFMgGC0eP4I3JuQwKc2oMcnM0GoMQUHgus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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