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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e7111febb2d56c83c9001f07e990c14da280eaf6863f32a93ebfba65b3cc8ff' 
  AND token = 'BAqlSB5edfPBV1RlHT2nDLyHofK+8AxBYytsexM+R2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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