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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7677bf8a773ff53205adaab2a71e7d0107d0c49f9111cbd381ca7992303d59' 
  AND token = 'zii6EMML1uKhDqxlo3pSfhoNn39gfkKves+YMvAcdLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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