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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f2449d3b25c5b02b0d2f48bc157ae0d1a7b4360f2cdf6e3f50697cd2c6e8d0' 
  AND token = 'NaARyPfR/o/zzZu8ATtMM/9zgnprfnWkGfzWiotJpTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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