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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f57df83203dc5a85ae6a2f8785a4f2e59ee87d075c9a966e80788108fc4f69' 
  AND token = 'vJ5cIuPcwvTN3ulDzJITYQtuQwAKd2wANIDQ5KvyzMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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