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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeb487362849a6f8c8e2b9d86d07e6622403267c9ba3ca77ad21cf1f22a5a47e' 
  AND token = 'BGZdz5K7NuXgtc5e+fnTrilrNxHWiCnpr7LdeMjMcas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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