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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bd8564aaa50c964abb1db0c4f9e5e7953b3613c652d7f36253d232a3dac2c9d' 
  AND token = 'tdgGr3WGOmMRzNUc8bGHbIc6xzGtANTWDcrOfWD+6WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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