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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3936e9d1f1045bef07053f4f4f961abb91ea841c25f611d95ed1b07aab31447c' 
  AND token = 'VS8x1IHWZg1rA/Kk+HQC1el/u88LYfRHT24LP8A1qCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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