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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4197e0fe97018c18d8f6b01906153d7842f0081ba9434c1139def62c30b7f3cb' 
  AND token = 'S0MfTkc3EGFGMeBWX4ntd8HLri34IPkO9jLYj0F+uQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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