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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeeab90084d71f416b319dc6d6e98cef906645829c1fc92303e90266c2cee50f' 
  AND token = 'AV+akqrHJp/J+MMX69H2s36MlsEgQuWX7G51NoRsKos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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