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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f81db382e54fa6a04d7bd560ac8c96edef1f0ddaf03e4ba2e6988a07c51a389' 
  AND token = 'cK1B14FolDIu96iPFYpuHTZjDimhvDjBp8DGDkH18yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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