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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1e55f2017440bb7caf835e73d16deb5856336d66f260a812950f6e39222d216' 
  AND token = 'mz+rSLw96mz5X8o+G2jZnne46Oh5Vw58S0WV9sGm6Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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