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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a96decce972fe3cdacefcd0bea8841508681910c97774da4919cf4ec8df96c7' 
  AND token = 'Hqu+npD4WauoseaV+Gd5x4jzUL4m7pMs2av3mppKnGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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